Possibly slipping an anoymous message to his supervisor to keep an eye out and let the chips fall as they may. I wouldn't stick my head out there and put your business on full blast because then you might be possibly dragged down with him and people might start suspecting things with you. You know how people think....guilty by association. That must be really difficult to work with him right there. Uggh...I would be so frustrated. I'm sorry you are having to deal with this at your place of employment too.